Absolutely not.
Churches- and ministers- are discriminatory by nature- and as such- as long as they are performing a marriage as a religious ceremony- even if it is also a civil ceremony- can discriminate however they wish.
However, if they are acting as a business- not as a church- then they are subject to the laws related to business's.
Where does the 1st amendment say your free exercise rights end automatically when you are selling something?
Where does it limit it expressly to Churches and Clergy?
Where does the 1st Amendment say that a person doesn't have to follow the law if he think his faith say otherwise?
The 1st amendment prevents the government from making laws that infringe on free exercise of religion. Like any right, it has limits, but those limits must be for a compelling government interest and then any remedy must be narrowly tailored to meet that interest.
Some guy selling apples who doesn't want SSM weddings taking place on his property is not a compelling government interest.
This might surprise you- but I actually agree with you on this. In this case.
Of course if the farmer actually followed the Bible- he would obey the law.
"Render unto Caesar" does not mean follow laws you think are wrong or immoral. And he followed the part of the law that was actually applicable to his actions in the jurisdiction to the letter.
Tell me what part of what Paul said here says 'except what laws you think are wrong or immoral'?
Romans 13New Century Version (NCV)
Christians Should Obey the Law
13 All of you must yield to the government rulers. No one rules unless God has given him the power to rule, and no one rules now without that power from God. 2 So those who are against the government are really against what God has commanded. And they will bring punishment on themselves. 3 Those who do right do not have to fear the rulers; only those who do wrong fear them. Do you want to be unafraid of the rulers? Then do what is right, and they will praise you. 4 The ruler is God’s servant to help you. But if you do wrong, then be afraid. He has the power to punish; he is God’s servant to punish those who do wrong. 5 So you must yield to the government, not only because you might be punished, but because you know it is right.
6 This is also why you pay taxes. Rulers are working for God and give their time to their work. 7 Pay everyone, then, what you owe. If you owe any kind of tax, pay it. Show respect and honor to them all.